Moon and tide effects on fish capture in a tropical tidal flat

Reis‐Filho, José Amorim; Barros, Francisco; Nunes, José de Anchieta Cintra da Costa; Sampaio, Cláudio L. S.; Souza, Gabriel Barros Gonçalves de

doi:10.1017/s0025315410001955

Cited by 18 publications

(18 citation statements)

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“…The estuarine fish fauna is strongly influenced by tidal cycles (Reis-Filho et al 2011). At low tide there is a decrease in habitat and increased population density of fish (the main prey of dolphins), and this increase in resource availability may result in a lower spatial requirement for the predators (Reis-Filho et al 2011).…”

Section: Discussionmentioning

confidence: 99%

“…At low tide there is a decrease in habitat and increased population density of fish (the main prey of dolphins), and this increase in resource availability may result in a lower spatial requirement for the predators (Reis-Filho et al 2011). Contrary to this expectation, we found no differences in area of use of Babitonga Bay franciscanas and Guiana dolphins between tidal cycles.…”

Section: Discussionmentioning

confidence: 99%

“…This is the period when tidal flats overflow, causing the fish to migrate to these important feeding areas (Reis-Filho et al 2011). Dolphins may use these areas opportunistically, as fish are more vulnerable to predation in these locations (Reis-Filho et al 2011).…”

Section: Discussionmentioning

confidence: 99%

“…Fish and crustaceans often modify their distributions and behaviours in response to variation in these environmental factors (Reis-Filho et al 2011). These tidal migrations involve the movement of large numbers of species between locations synchronously with the tidal cycle (Gibson 2003).…”

Section: Introductionmentioning

confidence: 99%

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Tidal and seasonal influences in dolphin habitat use in a southern Brazilian estuary

2017

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Summary:In this study we describe how franciscana and Guiana dolphin habitat use is influenced by tidal cycles and seasonality in Babitonga Bay. The franciscanas use a greater area in winter and a smaller area in summer, but the extent of the area used did not vary with the tide. Guiana dolphins did not change the extent of the area used within seasons or tides. Franciscanas remained closer to the mouth of the bay and the islands during ebb tide, moving to the inner bay areas and closer to the mainland coast during flood tide. Guiana dolphin used areas closer to the mainland coast during the flood tide. Guiana dolphin patterns of movement do not seem to be related to the tidal current. Franciscanas used sandier areas while Guiana dolphins preferred muddy areas, with some seasonal variation. We suggest that these dolphins modify their distributions based on habitat accessibility and prey availability. This study enhances our knowledge of critical habitat characteristics for franciscana and Guiana dolphins, and these factors should be considered when planning local human activities targeting species conservation.Keywords: tide cycles; survey method; franciscana dolphin; Guiana dolphin; critical habitat; Babitonga Bay; SW Atlantic Ocean. Influencia de las mareas y las estaciones en el uso de hábitat de delfines en un estuario del sur de BrasilResumen: En este estudio describimos como el uso del hábitat del delfín franciscana y delfín costero es influenciado por los ciclos de mareas y las estaciones en la bahía Babitonga. Las franciscanas utilizan áreas mayores en invierno y menores en verano, pero el tamaño del área utilizada no varió con las mareas. El área de uso del delfín costero no varió entre estaciones ni con las mareas. Las franciscanas permanecieron más próximas a la boca de la bahía e islas durante la marea baja, moviéndose hacia áreas más internas cercanas al margen del continente durante la marea alta. Del mismo modo, el delfín costero utilizó áreas cercanas al margen del continente durante la marea alta. Los patrones de movimiento del delfín costero no presentaron relación con las corrientes de marea. Las franciscanas utilizaron áreas con más arena mientras que los delfines costeros prefirieron áreas lodosas; esta preferencia varió estacionalmente para ambas especies. Sugerimos que estos delfines modifican su distribución en base a la accesibilidad del hábitat y la disponibilidad de presas. Este estudio aumenta nuestro conocimiento sobre las características del hábitat crítico para la franciscana y el delfín costero, y estos factores deben ser considerados en la planificación de las actividades humanas locales orientadas a la conservación de estas especies.Palabras clave: ciclos de mareas; método de barrido; delfín franciscana; delfín costero; hábitat crítico; bahía Babitonga; Océano Atlántico SO.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tidal and seasonal influences in dolphin habitat use in a southern Brazilian estuary

2017

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“…This area harbors a high level of biodiversity, comprising distinct habitats such as coral reefs, mangrove swamps and seagrass beds (CASTRO;PIRES, 2001;LEÃO et al, 2003;REIS-FILHO et al, 2010;REIS-FILHO et al, 2011). The bay has a stable annual water temperature, with low temperature fluctuation varying generally between 23º and 27º C (CIRANO; LESSA, 2007).…”

Section: Study Areamentioning

confidence: 99%

Community structure of shallow rocky shore fish in a tropical bay of the southwestern Atlantic

et al. 2015

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Southwestern Atlantic Ocean rocky shores sustain important reef fish communities. However, those communities in tropical regions are not well understood, especially in Brazil. In this present article we assess community parameters of reef fishes such as composition, trophic organization and their relationships with physical and biological factors on four tropical rocky shores in Todos os Santos Bay, southwestern Atlantic. During six months, a total of 80 visual censuses were performed, in which 3,582 fish belonging to 76 species were recorded. Territorial herbivorous fish and turf algae were dominant at all the sites. The spatial variability of fish community structure was related to the benthic cover composition and depth. The high abundance of territorial herbivores and mobile invertebrate feeders could be associated with high levels of turf cover, low wave exposure and shallow waters. Moreover, this fact could be a consequence of the low density of roving herbivores and large carnivores probably due to the pressure of intense fishing activity. Thus complementary studies are needed to evaluate the actual conservation status of these rocky shore reefs, singularly located habitats connecting inner and outer reefs in Todos os Santos Bay.

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Evaluating temporal and spatial transferability of a tidal inundation model for foraging waterbirds

et al. 2022

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For ecosystem models to be applicable outside their context of development, temporal and spatial transferability must be demonstrated. This presents a challenge for modeling intertidal ecosystems where spatiotemporal variation arises at multiple scales. Models specializing in tidal dynamics are generally inhibited from having wider ecological applications by coarse spatiotemporal resolution or high user competency. The Tidal Inundation Model of Shallowwater Availability (TiMSA) uniquely simulates tides to empirically derive a time-integrated measure of availability for a shallow-water depth range defined by the user. To evaluate temporal and spatiotemporal transferability, we employed TiMSA at the development site in the Florida Keys and at novel subsites in the Florida Bay (application site) under a different time period (application period). We used foraging little blue herons (Egretta caerulea) as the ecological unit with which to constrain the model's "water depth window," that is, range of water depths to estimate shallow-water availability.At the development site, temporally consistent water depth windows contrasted with interannual variation in shallow-water availability, which revealed short-term changes in Little Blue Heron foraging habitat. At the application site, water depth accuracy varied by subsite and was correlated with spatial error in bathymetric elevation. Although TiMSA parameters were sensitive to environmental temporal variation and uncertainty in spatial data, a spatially explicit water depth window generated reliable estimates of shallow-water conditions over space and time at the development and application sites. By exploring the contributing factors to model error, we provide solutions to reduce uncertainty of TiMSA parameters at potential application sites and recommendations for addressing bathymetric inaccuracy in digital elevation models. Accurately quantifying spatiotemporal changes of shallow water has implications for monitoring habitat conditions for tidally influenced species and projecting future changes to coastal ecosystems in response to anthropogenic stressors and natural disturbances such as sea level rise.

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Moon and tide effects on fish capture in a tropical tidal flat

Cited by 18 publications

References 43 publications

Tidal and seasonal influences in dolphin habitat use in a southern Brazilian estuary

Tidal and seasonal influences in dolphin habitat use in a southern Brazilian estuary

Community structure of shallow rocky shore fish in a tropical bay of the southwestern Atlantic

Evaluating temporal and spatial transferability of a tidal inundation model for foraging waterbirds

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